Arch for furnaces



l. W. Z.

ARCH FOR ACES.

APPLICATION FILED APR.25.1918.

1 346,01 0 Patented July 6, 1920.

UNITED STATES EBA w. ron'rz, or CHICAGO, ILLINOIS.

w ARCH FOE FURNACES.

ease-1o.

Specification of Letters Iatent.

Patented July ,6, 1920.

Application filed April 25 1918. Serial N0. 230,677.

ter shown in patent to Brown, No. 528,588,

of November 6, 189st.

The object of the invention is to provide an improved design of arch for retarding I the flow of the current of air and gas produced from the fuel and which has an improved action in directing the gas and air in a thin sheet against the flame leaving the rear part of the bed of fuel, and which may be readily applied to furnaces of different widths without necessitating redesign of its individual parts. A further object of the invention is to provide an improved means for supporting furnace arches and to protect their lower edges from injury and prevent their disintegration by heat.

An illustrative embodiment of the invention is shown in the accompanying drawings, in which-- Figure l is a side elevation of a furnace provided with the improved arch, part of the surrounding shell of the furnace being shown broken away, and the arch being shown in section.

Fig. 2 is a sectional view on the line 2-2 of Fig. 1.

Fig. 3 is a horizontal sectional view oi the arch, taken on the line 3"?) of Fig. 2.

Fig. l is a vertical sectional view taken on the line 4- of Fig. 8.

Arches or battle walls designed to effect the same general purpose as the present arch are usually provided with vertical. channels for conducting the gas and air collected in front thereof downwardly therethrough toward the rear of the grate. With the present construction, the necessity for providin z' for such ve tical channels is avoided by making the arch with two spaced and solid walls the foremost one of which does no reach the crown sheet of the furnace, and therefore provides a space communicatir; with the upper part of the firebox and with the space between the walls. The space between the walls is comparatively thin, but of considerable width, and accordingly, the air and gas traveling downwardly through this space are effectively heated by contact with considerable surface area of the walls. l-lighly ellicient combustion takes place, due to the wide distribution of the thin sheet oi highly heated air and gas in the flame arising from the fuelon the rear part of the grate.

In the construction shown in the drawings, the firebox 1 of the furnace is shown divided into forward and rearward compartments 2 and 3 by the transverse walls a and 5. The forward compartment serves as a gas producing region, and the portion 3 is in direct communication with the combustion chamber or flucs of the furnace. The walls l and 5 respectively rest on transverse pipes 6 and 7 which are in open communication with the sides of the boiler. Metallic riders 8 of about the same length as the brick employed in the construction of the walls are located between the pipe 6 and the bottom edge of the wall a, for the purpose of preventing this wall from disintegrating or being broken at its lower edge. These riders are kept comparatively cool by being in contact with the pipe 6 through which water may circulate. The wall 5 extends upwardly into contact with the crown sheet of the furnace, completely separating the compartments 2 and 3, while the wall t does not extend upwardly as far as the crown sheet, and accordingly provides av space 9 which serves as a communicating passage between the compartment 2 and the space 10 between the walls a and 5.

In order to make the entire structure more rigid and secure, the separate walls 4.- and 5 may be connected together or stayed by interlocking bricks 11 as shown in Figs. 8 and 4:.

In the operation of the furnace, it may under certain conditions operate as a downdraft furnace, but when a greater quantity of gas is collected in the region 2 than may be carried off by the draft through the fuel, an outlet is afforded for such gas by the passages 9 and 10. The space 10 between the walls 4 and 5 is purposely of slight thickness, in order to cause the gas to pass through said passage at considerable velocity and in contact with the maximum surface of the walls, so that the gas will become heated and be delivered in a thin sheet which cuts the flames arising from the fuel at the rear of the grate,

Although but one specific embodiment of this invention has been herein shown and described, it will be understood that numerous details of the construction shown may be altered or omitted without departing from the spirit of this'invention as defined by the following claims. p

I claim:

1. In a furnace having a firebox and comin said firebox, a boiler pipe extending through the firebox above the grate and communicating with the sides of the boiler, a dividing wall in the firebox above said boiler pipe, and a metallic rider between said boiler pipe and dividing wall, said rider having a vertical flange extending along one side of the lower edge of said wall.

8. A furnace of the class described, comprising a boiler forming a firebox, a grate in said firebox, a boiler pipe of circular cross section extending through the firebox above the grate and communicating with the sides of the boiler, a dividing wall in the firebox above said boiler pipe, and a metallic rider between said boiler pipe and dividing wall, said metallic rider having vertical flanges embracing the lower edge of said wall and the bottom surface of said rider conforming to the curvature of said pi Signed at Chicago this 20th day f A i IRA w. FOLTZ. 

